Clash Royale CLAN TAG

GMSMapView resize - strange flicker/blink effect

I have a subview including GMSMapView in my controller - initially it's collapsed and takes just a part of screen - then a user can expand it and see the map in fullscreen mode.
The code below works however there is a strange flicker at the end of the animation
Here is my code:

let screenHeight = screenSize.height
let proportionalHeight = (screenSize.width * 46.0 ) / 75.0
mapViewHeight.constant = !isMapFullscreen ? screenHeight : proportionalHeight

UIView.animate(withDuration: 1.0, delay: 0,
usingSpringWithDamping: 0.9,
initialSpringVelocity: 0,
options: UIViewAnimationOptions.curveEaseInOut,
animations: {
self.view.layoutIfNeeded()

},
completion: { finished in
if finished {
self.isMapFullscreen = !self.isMapFullscreen
}
})


video

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